cmm

### Gage Scan Calibration Strategy

The gage scan filter enables you to measure forms of circles and cylinders with the highest possible accuracy by comparing the scan on a master ring or plug of a similar size and placed at the same location on a CMM. You can use this filter to measure production rings or plugs, and circular features on parts with very tight form tolerances.

The Gage Scan Calibration strategy for Auto Circles calibrates a probe tip for use with the gage scan filter. The Gage Scan Calibration data is stored in the probe file. The gage scan filter is available with the Adaptive Circle Scan and Adaptive Cylinder Concentric Circle Scan strategies.

If you calibrate the probe tip again, PC-DMIS deletes the Gage Scan Calibration data. You will need to perform the Gage Scan Calibration again.

The Gage Scan Filter option is in the Edit Probe Data dialog box (Insert | Hardware Definition | Probe | Edit button). The Gage Scan Filter option for each probe tip indicates if Gage Scan Calibration data is available. For information on this option, see "Gage Scan Filter" in the "Defining Hardware" chapter in the PC-DMIS Core documentation.

For best results:

- Use Gage Scan Calibration to calibrate a probe tip with a ring gage to accurately measure inside holes.

- Use Gage Scan Calibration to calibrate a probe tip with a plug gage to accurately measure outside holes.

- Use Gage Scan Calibration to calibrate the probe tip using a ring or plug gage with the diameter as close as possible to the part that needs to be accurately inspected.

- To get the highest accuracy, you may want to place the ring or plug gage at the same location on the CMM where you would place the part for inspection.

- If you use the Software Compensation option for Gage Scan Calibration, you can improve the accuracy by defining a point density (sample frequency) for the feature to measure with a value as close as possible to the point density used in the gage calibration. Since the gage scan filter is applied in the frequency domain, achieving a greater similarity between the gage's point density compared to the feature scan's point density results in a correction that is more effective.

The strategy's tabs are located in the Probe Toolbox in the Auto Feature dialog box (Insert | Feature | Auto | Circle):

- Setup tab

- Advanced tab